Even at reduced logo sizes, I struggled with this. Also, even uploading an image in that dialog became problematic and will just freeze and not offer the upload drop area … once it did offer the upload drop area, but then froze when I began to upload a file and never completed the upload.
All of these with no errors displayed anywhere and debug enabled …
So, I reasoned that it may have some conflict with media related plugins, so I disabled the 2 media related plugins I have … Enhanced Media Library and Media Library Assistant.
Eventually I was able to get round this problem … but I cannot say conclusively if this was a conflict with either media plugin and I just don’t have the time to troubleshoot it.