Selecting a proxy session causes the UI to freeze

If I select a proxy session the Pro interface will freeze. I'm on the latest beta, but it also happened with the latest released version. It would also happen with SS Version 6.0.

It doesn't happen with all proxy sessions and I can't figure out what the cause is. I have been able to determine that I can create a proxy, open a few pages in FireFox, then close and open again. After I open again it could freeze when selected. This only happens after a close and open. When selecting something else, then going back to the same proxy before the close it would not freeze.

Is there a cache I can clear for any/all proxy sessions without running a new installation? I should also add that I have tried a completely new installation and over time the issue pops up again.

=========================================================
=================== Log Variables with Message ===============
screen-scraper Instance Information
=================== Static Values ================
Java Vendor: Oracle Corporation
Java Version: 1.8.0_66
OS Architecture: amd64
OS Name: Windows 8
OS Version: 6.2
Scrape HTTP Client: AsyncScrapingHttpClient2
SS Connection Timeout: 180 seconds
SS Edition: Professional
SS Extractor Timeout: 30000 milliseconds
SS Max Concurrent Scraping Sessions: 5
SS Maximum Memory: 1024 MB
SS Run Mode: Workbench
SS Version: 7.0.8a
======== Message logged at: 04/25/2017 10:42:26.154 CDT ========
=========================================================