I think you should try to assign another version of Wine to Silkroad. Try with Wine 0.9.58 or 0.9.50 (which are known to be the best versions for Silkroad).
To do it, in POL, use Tools > Manage wine versions
You can try to set the OS as Windows XP too.
To do it, in POL, use Tools > Configure wine
I didn't tried yet because of their f***ing website which don't want anything else than IE (So I can't download the client)