mono 1.0.1 : different calling conventions ????

I have downloaded the latest stable binary wx.NET (0.5) and it worked fine
some time ago but now it doesn't work anymore.
I have "only" reinstalled a newer linux distribution (Mandrake 10.1)
provided with mono 1.0.1 and now when I run my application I have the
following error :

Unhandled Exception: System.DllNotFoundException: wx-c in <0x00053> (wrapper
managed-to-native) wx.App:wxApp_ctor () in <0x00012> wx.App:.ctor () in
<0x0000a> LetItBurn.LetItBurnApp:.ctor () in <0x00021>
LetItBurn.LetItBurnApp:Main ()

I have copied wx-c.so in /usr/lib AND in the current directory but it is
always the same.

Don't know what to do, everything is like mono environment cannot find the 
Dll anymore.

I have also tried to recompile wx.NET with the lastest wxGTK-2.5.2 but there
is a compilation error.

Please help




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