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?