Thank you for letting us know. We are seeing some strangeness with IE10 on the boards.
We're working with Jive on short term and long term fixes. There seems to be an issue at times with the Reply function... but this is the first time I've heard of the drop downs and such being an issue.
Short term: we're getting some fixes back ported... (not the best, but it gets us further along)
Long term: we're looking at upgrading to the latest version and what that will take. As with all "platforms"... it takes some doing.
Thanks for bearing with us.
Michael