Attaching reference file causes Microstation to crash (Connect U 16)

I've been experiencing this problem on & off for a while now, but now I have a file that crashes every time I try and attach a reference file. It doesn't matter which approach I try, drag & drop from the model dialog box or File-Attach from the reference dialog box, I get the same result:

I've tried compressing the file, deleting my user preference file, and running VerifyDgn in SS10 to clean up the file, to no avail. Has anyone else had this problem with Connect?

Thanks,

Kevin