Error: The filename, directory name, or volume label syntax is incorrect. (WriteToDisk)

[yoni2020]

Suddenly started seeing this error message ("Error: The filename, directory name, or volume label syntax is incorrect. (WriteToDisk)") on the progress bar of every torrent I've tried to download since last night. Not finding any documentation around this in these forums or on Google. Running uTorrent 3.5.5 (build 45704 32 bit) a Dell laptop with Windows 10. Screenshot is attached. Anyone know what's going on?

[SergeyQA]

I can not reproduce that unfortunately (or fortunately?). 

[yoni2020]

@SergeyQA, thanks for checking. For the sake of documenting my progress for others, I was able to download a different torrent without experiencing this issue. The issue still persists with a few other torrents, and I don't have a solution for it. This is the first time I'm seeing this in more than ten years of torrenting.