I have a fresh install (same thing happened with a fresh install of V4.1.7) of V4.1.8 on a Windows 2016 IIS server v10 - PHP 7.2.7, MySQL ver 8.0.13

When I go to Configuration>File Manager I get "An error has occured and the file list could not be loaded: Error: You don't have permission to this folder" (see screen shot)

I have read/write to the Application>config, Upload, & Temp folders

Likely related when I to add an image I get a pop-up [objecdt Object} (see screen shot).

I've replicated this in Safari, Chrome, Firefox, & Brave on PC and Mac

I have used lime survey since v1 and have 3.21.2 running on the same box - no issues.

Any guidance would be greatly appreciated.

Please file a bug report.