Exception has been thrown by the target of an invocation

Upgraded yesterday from Studio 2014 to Studio 2015 (Freelance) and now wish I had not. 

Client sent me just now 3 sdlxiff files to translate and I get the "Exception has been thrown by the target of an invocation" message. The files open but I cannot translate them or add a TM to it, nor save nor do anything. 

Can anyone help? I cannot go back to Studio 2014 either as I had to deactivate it to activate 2015. 

And do I need to say I have a deadline for this job? 

Thank you

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