Blank Edit Bar and 500 Internal Server Error

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I have moved a site that worked fine on the development server, but now it having a couple of issues.

When I log in to edit, I find the edit bar showing up blank 90% of the time. If I bounce through the menu, I'll finally hit a page that gives me the edit bar, then I clear the cache and I'm usually able to edit the page I need to change. Does anyone have a suggestion for solving this?

Also, as I navigate through the site (in or out of admin mode), I sometimes hit a 500 Internal Server Error on a page, which never happened on the development server. Once I refresh, the page usually loads. Are these problems connected?

Thank you -