Error about "Invalid culture identifier" in Studio 2015

 Hi,

I installed Studio 2015 Freelance and encounter this problem when working on projects. The Confirm function doesn't work for many segments (these can be empty, 100% matches or other fuzzy matches). The strange thing is that this doesn't happen to all segments of the file. For the moment I just manually change the segment status to translated for those segments that don't work normally, but the problem is that this doesn't update my TM.