DoubleScroll
Kaleidoscope 2.0 offers its own Scroll Bars have Double Arrows option, so DoubleScroll is no longer necessary. Registered users of DoubleScroll can upgrade to Kaleidoscope 2.0 for $15.

Ircle 3.0b10
Ircle 3.0b10 does not draw push button titles in some of its windows when used with Kaleidoscope 2.0 schemes. This problem will be fixed in the final version of Ircle 3.0.

Claris Emailer
Claris Emailer windows revert to their original size when you launch the application. Apparently, Emailer does this if it thinks the window is offscreen. However, the thicker borders of the new Kaleidoscope  2.0 schemes sometimes spill offscreen, triggering this behavior. This is a bug in Emailer, and there is nothing we can do about it in Kaleidoscope. To work around this, make sure your entire window, including its border, is onscreen. 

Date & Time Menubar Clock
Kaleidoscope lets the scheme specify the color of the menubar clock. However, if you check the “Use custom clock color:” box in the “Clock Options...” dialog in the Date & Time control panel, the color listed there will override the color specified by the scheme. Also, some beta Kaleidoscope 2.0 schemes had a bug that made the menubar clock invisible; this is not a bug in Kaleidoscope.

Appearance Extension
The Appearance Extension needs to load before Kaleidoscope. This is how it normally works, so there should be no problem. However, if you are tempted to force Kaleidoscope to load earlier in order to savor its enhanced startup progress bar, be sure that it loads after the Appearance Extension.

WindowShade
If you are using System 7, you should disable the WindowShade control panel. WindowShade prevents collapsed windows from changing shape when you switch schemes. Also, when double clicking a title bar, the window collapses
in two stages, and you may hear two sounds.

Deskpop 1.0.1
Deskpop 1.0.1 could prevent Kaleidoscope from colorizing the Apple menu. This problem was fixed in Deskpop 1.0.2.

Snitch 2.5.1
In Snitch 2.5.1 and earlier, some of the the edit box text (type, creator, dates, sizes, etc.) may be invisible with certain schemes. This problem was fixed in Snitch 2.5.2.

Helium 3.0
Helium 3.0 causes the Kaleidoscope control panel to crash when you select a popup menu. This problem was fixed in Helium 3.1.

Suitcase 2.1.4
Suitcase 2.1.4 can cause serious problems with Kaleidoscope, and if you want to use it, you must make Suitcase load after Kaleidoscope. To do this, put the Suitcase 2.1.4 extension in your Control Panels folder (it will work just as well there as it does in the Extensions folder, except that will no longer conflict with Kaleidoscope). Suitcase 3.0 does not have these problems with Kaleidoscope, and I recommend that Suitcase 2.1.4 users upgrade to version 3.0.

SmartScroll
To use SmartScroll with Kaleidoscope, you must have SmartScroll version 2.03 or higher. You can get the latest version of SmartScroll from Marc Moini's home page: http://www.kagi.com/authors/marc/ .

Retrospect 3.0
When the Substitute System Font feature is enabled, Retrospect 3.0 puts up a font warning box. There really is no problem, Retrospect 3.0 continues to work normally once you dismiss this box. Please note that this problem happens only when Retrospect is launched manually, so it does NOT prevent Retrospect from performing automated backups. Dantz has fixed this problem in Retrospect 4.0. For more information on Retrospect go to: http://www.dantz.com.

SiteMill
When the Substitute System Font feature is enabled, some versions of SiteMill put up a font warning box. There really is no problem; SiteMill continues to work normally once you dismiss this box. If you have this problem with SiteMill, you should ask Adobe to fix it.

FrameMaker
When the Substitute System Font feature is enabled, FrameMaker may refuse to launch, claiming it “cannot initialize the font arrays”. This problem is a bug in FrameMaker, and I have received several reports that Adobe has fixed it in the latest version of FrameMaker. If you do have this problem, try turning off font substitution in Kaleidoscope, launching FrameMaker, and then turning font substitution back on. This bypasses FrameMaker's font checking, and it may prevent the problem when you launch FrameMaker again.

Stickies
Windows in Stickies do not have a WindowShade widget. This is because they do not need one! To collapse a Stickies window, just <option>-click on its zoom box. This is a feature of Stickies, not of Kaleidoscope.

Finder Window Background Color
When you quit from an application that modifies the system color palette, some Finder windows may be left with splotches of random colors in them. This will go away as soon as the offending windows are re-drawn. This annoyance is inherent to the system, and nothing can be done about it. This problem happens only in 256 colors.

Now Menus
If you are using Now Menus, it overrides the Kaleidoscope system font settings in some menus. If you want all your menus to use the system font you have selected in Kaleidoscope, set the font in Now Menus to “Default” and set the size in Now Menus to the same size you are using with Kaleidoscope. There really is no problem here, but some people are not aware that Now Menus provides font and size settings and may think this is a bug in Kaleidoscope.

Director, SoundEdit, FreeHand, Fontographer, form•Z RenderZone, InfiniD, DenebaCAD
The menus in these applications are black and white instead of using Kaleidoscope's menu colors. These applications are excluded intentionally because their custom menu routines do not support color correctly.

Eudora
With some system fonts, the icons at the top of Eudora message windows overlap their check marks. The fonts that come with Kaleidoscope have been specially modified to avoid this sort of problem. In particular, if you want to make Espy Sans your system font, you should instead use the Espi Sans font included with Kaleidoscope.

ClarisWorks
With some system fonts, the keyboard shortcuts in ClarisWorks menus get cut off. The fonts that come with Kaleidoscope have been specially modified to avoid this sort of problem. In particular, if you want to make Espy Sans your system font, you should instead use the Espi Sans font included with Kaleidoscope.

PopupFolder
The popup menus drawn by PopupFolder do not use Kaleidoscope's menu colors. PopupFolder's custom menu routines do not support color menus, and there is nothing I can do about this.

Panorama, First Class, Lotus Notes
These applications all assume that the window title bar extends the full length of the window, which is no longer the case with some Kaleidoscope 2.0 schemes. Panorama normally gives you a popup menu if you click the window title, but it assumes the window title is in the middle. As a result, that popup menu may be inaccessible. The First Class client attempts to put a progress bar in the window title bar, but with the different window shapes, this progress bar may spill over onto the desktop (or whatever is behind the window). Lotus Notes has a similar problem.