For the time being, until another solution has been found, save the file in MemoQ. Export there bilingual to mqxliff, translate this in Studio, import in MemoQ and create a target file there.

Thanks for the tip Jerzy! That's what I will probably have to do, although it will mean having to buy a MemoQ license, since the trial version will expire before I can finish this assignment. I was really hoping to be able to solve the problem in Studio, but the client has now sent me a new file and it didn't change anything.

Could the solution be splitting the file (maybe simply in sdlxliff) into smaller chunks. You can also go that way: export from MQ on your PC. Then, when finished take a PC of someone else, copy the MQ project from your PC there, install a trial there just before finishing, double click the project file and use this MQ copy for finishing. I understand, this is not the way it should work, but a workaround, and a very unconventional one, but it should help you to deliver. And in the end of the day this is what counts.