I worked with a GM to confirm the steps that caused my crash. 100% repeatable steps.
1. Bring up the Inventory screen.
2. Click on the new "Badges" tab.
3. The "Badges" tab can close or stay open, it doesn't matter for the crash.
4. Clicking on the "Progress" tab in the character screen crashes the client.
The two tabs seem to share the same information, or some of it. There's likely a DB query string or the UI element to end the request in "Badges" isn't closed after the tab appears or is closed leaving it as a constant DB request, and when the second request to "Progress" is made with the existing open request in "Badges" it causes a memory leak (maybe). I haven't had task manager open to verify that guess when I reproduce the crash.