blank import window in history center

 
Hi,

I have searched the forums, and I've seen, this has been an issue for many, I haven't found a solution though, I hope I was blind...

Problem: when trying to import a .csv or a .hst file, at import window of history center, after selecting the appropiate file,the window stays blank. SOMETIMES data loads okay. MOST of the TIME it stays blank though. I do not understand what makes a difference here.

Testing of problem: I exported data first from history center and I tried to import that data back. So filename, and .csv structure, separators,etc. should match!

Regards
Reason: