Problems logging into site using IE

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If I try logging into my C5 site with IE, it just continues to re-display the login page even though it seems like it actually did log me in. I read somewhere in the forums that checking the remember me box will fix the issue. After doing that it logs me in but I have no editing rights. I can't even see the editing toolbar at the top (the bar with the C5 logo, Edit button, Dashboard button, etc.) In the sitemap I can only click on the top level pages. If I click to expand a page, it says access denied.

This is totally weird and something I've experienced before but have never discovered a workaround. In the past, I just loaded up a different virtual PC (I'm on a Mac) and it would work. Now my last virtual PC I have setup is doing this too. I've tried clearing out all my cookies/cache etc. but still having this issue.

Has anyone else ever dealt with this or know what I could do to fix it or at least work around it?