Uipath: lastest avalaible stable version in the platform.uipath.com (I think v2019.10.4)
.Net version: Tried both the oldest required as seen here: Hardware and Software Requirements and the newest 4.8.
Activities packages: tried reinstalling all of them and installing and tried different versions and nothing.
Desktop experience was installed. and all of the features needed in Windows Server.
A bit late reponse on my end. Did you solve this problem already @AlexJA ?
Did you have any other software installed on which you use the select element (or are you just using browsers).
The only thing i could find which would come close is, that the installation did not go as supposed to. Im running several Server 2012 installations, but i cannot reproduce this problem. Do you see anything in eventviewer on this problem?