Besides the many symptoms that can cause Server Error 0; another likely one occurs when you use semicolons instead of commas to separate your category names. This causes the category to be read as one giant category, forcing a truncation at the server level.  There is an easy fix. Copy the category names into notepad, hit CTRL+H to do a Replace, and change the semicolons to commas.

You can set Live Writer to automatically tweet your posts when you publish with this handy Twitter plug in by shoutmeloud. Download the plug in Twitter Notify.