The capi:interface-override-cursor is ignored by capi:text-input-pane which always displays its usual I-beam cursor. This is due to a limitation in the way that text-input-pane is implemented by GTK.
The normal navigation gesture (Tab) is treated as an editor command in capi:editor-pane and IDE tools based on this. Instead, use Ctrl+Tab to navigate from an editor pane in GTK+.
In GTK+ versions older than 2.12, the value of capi:option-pane enabled-positions has no effect on the visible representation of the items. In later versions of GTK+, the disabled items are grayed out.
In GTK+ versions older than 2.12, capi:display-tooltip does not work. In version 2.12 and later, the :x and :y keyword arguments of capi:display-tooltip might not be handled.
The Motif GUI does not work "out of the box" with Fink because LispWorks does not look for libXm etc in /sw/lib/.
Multithreading in the CAPI is different from other platforms. In particular, all windows run in a single thread, whereas on other platforms there is a thread per window.
The debugger currently does not work for errors in Cocoa Event Loop or Editor Command Loop threads. However, there is a Get Backtrace button so you can obtain a backtrace and also a Debug Snapshot button which aborts from the error but displays a debugger with a copy (snapshot) of the stack where the error occurred.
The online documentation interface currently starts a new browser window each time.
Setting *enter-debugger-directly* to t can allow the undebuggable processes to enter the debugger, resulting in the UI freezing.
Inspecting a long list (for example, 1000 items) via the Listener's Inspect Star editor command prompts you about truncation in a random window. If you cancel, the Inspector is still displayed.
The Definitions > Compile and Definitions > Evaluate menu options cause multiple "Press space to continue" messages to be displayed and happen interleaved rather than sequentially.
The Buffers > Compile and Buffers > Evaluate menu options cause multiple "Press space to continue" messages to be displayed and happen interleaved rather than sequentially.
The capi:interface-override-cursor is ignored.
Some graphics state parameters are ignored, in particular operation, stipple, pattern and fill-style.
LispWorks ignores the System Preferences setting for the smallest font size to smooth.
There is no support for state images or checkboxes in capi:tree-view.
capi:with-page does not work, because Cocoa tries to control page printing.
The :help-callback initarg is only implemented for the :tooltip value of the type argument.
The :visible-border initarg only works for scrolling panes.
Caret movement and selection setting in capi:text-input-pane is implemented, but note that it works only for the focussed pane.
capi:docking-layout does not support (un)docking.
There is no meta key in the input-model of capi:output-pane. Note that, in the editor when using Emacs emulation, the Escape key can be used as a prefix.
There has been no testing with 256 color displays.
Some pinboard code uses :operation boole-xor which is not implemented.
The default menu bar is visible when the current window has no menu bar.
capi:tree-view is slow for a large number (thousands) of items.
The editor displays decomposed characters as separate glyphs.
The :gap option is not supported for the columns of capi:multi-column-list-panel.
capi:display-dialog ignores the specified :x and :y coordinates of the dialog (for drop-down sheets the coordinates are not relevant, and for dialogs which are separate windows Cocoa forces the window to be in the top-center of the screen).
LispWorks Release Notes and Installation Guide - 19 Oct 2017