Unable to maintain site

For the past few weeks, clicking on "edit" only results in a blank screen. I must be able to update our business site on a regular basis. Originally guessed it was due to the ongoing maintenance. Just read in the maintenance thread that whatever is happening on the back end should not effect our ability to maintain web content. What's going on? When should I be able to expect a correction? or do I need to look for a different web solution?  www.drivetimedriving.com