You may try implementing it on a default wordpress theme setup to see if masking works. We are just trying to isolate the issue from Classipress and if it does then it would confirm it then.
Please help our moderating team work more efficiently by not sending us support questions via PM. You can read more about how AppThemes support works
here. However, you can send a PM to follow up and remind me if I missed your support request/thread.
Thank you and have a nice day.