Cura: All of a sudden "Open File(s)" freezes Cura 4.2.1

[blibenson]

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Application version

4.2.1 or 4.3 Beta. After having the issue, I re-installed 4.2.1 but the problem persisted so I tried installing the 4.3 beta. Same exact problem. It appears that something is corrupted and a clean install does not fix the issue.

Platform

Windows 10 with an NvidiaGTX 1070 and the latest drivers

Printer

Railcore II 300 ZL

Reproduction steps

I can't get it to stop! I can open an STL by double clicking to start Cura, however, starting Cura and clicking Open File will result in an empty file dialog box that says "working on it" forever. Re-installing 4.2.1 did not resolve the issue.

Actual results

Expected results

Had worked properly for weeks.

Additional information

[nallath]

So it used to work for 4.2.1, but after you installed Cura 4.3 beta both of them stopped working?

[fieldOfView]

I think this may be specific to the Downloads folder on Windows.
See https://www.laptopmag.com/articles/slow-windows-downloads-folder

[blibenson]

So a couple of things. When I empty the download folder it works fine. I then copied all the .stl files back and it worked as usual. Not sure if a particular file was causing the issue. I will close the thread tonight.

[blibenson]

So it used to work for 4.2.1, but after you installed Cura 4.3 beta both of them stopped working?

Not exactly. It stopped working under 4.2.1 so I tried 4.3 then tried re-installing 4.2.1. Failed both times until I re-created the download folder. I am running 4.3 now.

[jay-packet]

I've verified an issue. If Cura's splash/load screen appears on my main monitor ( I have three monitors active) and Cura's interface loads on a different monitor it will freeze. As soon as I disconnected the other two monitors to force Cura to load the splash screen and the main screen on the same monitor it fixed the issue. No problems loading and no freezing. I'm using Cura 4.3.0