I recently installed Helvetica on my Windows Vista, and since then, the font on my Tumblr homepage changed to Helvetica and it doesn't look right. The spacing looks all wrong and some words look jumbled and mixed up, it's very hard to read. I've tried changing the font settings on Firefox but it doesn't work, and I only encounter this problem on Tumblr. Any ideas? I don't want to have to uninstall...