<< << We are really interested to know what kind of issues you'll have with << wxWidgets 2.9. There has been not a lot of checks with this release, so << any issues you find are definitely interesting.
*IsEmpty* now has some ambiguity issues: see for instance ldg/ldgServer.cpp my intuition was to change IsEmpty to IsTextEmpty the wxWidgets 2.9 online documentation has a paragraph about it, see:
Hmm, looks like that is a change in 2.9.4 (it works OK in 2.9.3). I'm not sure I want to go chasing this one yet - it seems like a widespread change that will be somewhat hard to find without the compiler throwing errors. Better to wait until 2.9.4 is released I think (rather than start continuously updating for upcoming versions).