Just got this problem a little while ago. Regardless of what I search for in the plugin search in 2.7 I get no results and the following shows up in the search box: 61fb00d40f2b0e75a22200b4221d83a7.
Any idea why? I was using the WordPress Download Monitor plugin when this happened (updating a download). Deleted the plugin and it still happens. Also, the downlaods no longer appear in the edit page. Instead, I just get a "No downloads found" with 61fb00d40f2b0e75a22200b4221d83a7 appearing in the search.