I was playing with IE's settings to reproduce the problem you're experiencing.
One thing you might try is the solution described here:
Alternatively, could you try turning off Compatibility Mode of IE and see if you get the same issues:
Also, possibly try turning off Protected mode to see if that affects your issue anyhow.
Please let me know if that solves the issue!
By the way, are you using IIS or the built-on server that Sitefinity's project manager starts? I would recommend going for IIS and trying if that helps. There are a lot of benefits when doing so.
Grisha 'Greg' Karanikolov
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