So it looks like the applicaiton server software is wx/wxPython?  If so, that might be the snag.  Version 2.8 (which it looks like Poser is using) is 32-bit Carbon, which apparently won't work in Lion.  Version 2.9 introduced a 32/64-bit Cocoa flavor that apparently is Lion-friendly.  I optimistically downloaded wx 2.9 and tried to swap out all of the scripts in the Poser .app file with the 2.9 versions -- hoping for a simple temporary work-around -- but Poser was having none of it.