service desk bug description field isn't working after update

[Uptime Engineering GmbH]

we recently updated our jira (software 8.12, core 8.12 and service desk 4.12).

since then, in service desk tickets eg. bugs, the description field and the comment fields are showing strange behaviour.

• The field is there, but if writing text to it, the text isn't shown to the user.
• if clicking the edit-pen
  • already inserted text isn't shown
  • the switch between Visual and Text is grayed out
  • the field gets a blue border
• 
• if clicked into the field, the inserted letters are interpreted as shortcut, opening other functions of jira like "Assign to:"

Problem appears only on the Service Desk Projects. In Software-Projects it works.

Screens, field definitions, permissions,... havn't changed. Thinks worked fine before.

Can you please help me, finding the problem?

[Uptime Engineering GmbH · Accepted solution]

okay, we had a problem with our proxy server.

[Fahad Siddiqui]

In description below instead of visual can you click text and see if the details are appearing or no? 

[Uptime Engineering GmbH]

I can't switch between visual and text - both are grayed out.

[Fahad Siddiqui]

@Uptime Engineering GmbH please go through the below link, this will help in fixing your reported issue.

https://jira.atlassian.com/browse/JRASERVER-66408 

[Uptime Engineering GmbH]

unfortunately thats not working - I think there is a problem with the field renderers, any suggestions where to check this? 

jira logs following error: "...Error getting the field renderers for projectKey ... or issueKey null: java.lang.IllegalStateException: Duplicate key jira-text-renderer"