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Created attachment 229 [details]
ToolStrip-HandleClick-Bug.tgz contains a simplified test program that exposes the crashing bug. It also contains a proposed patch.
The HandleClick method in ToolStripItem does not check for Parent being null (unlike most methods in that class). This is causing crashes in a program that I'm helping to develop. It does not crash on Windows using the standard Microsoft .net libraries.
Created attachment 230 [details]
Here is a proposed patch.
The test case was built in MonoDevelop 2.4.
The test case archive does not contain the patch, contrary to my original comment.
This bug affects both the 2.8 and 2.10 branches.