I'm having a similar issue, but I believe it started after recent update to IE-11, that or a same-day update to Nvidia GeForce Experience/drivers is the problem. I'm running Win-7/64.
It started out with a Forms2GO form not displaying properly in IE-10, so I updated to IE-11. No change. Then, I noticed that Xara was uploading many more than just the recently changed files. Then, ALL my files at my webhost (GoDaddy and they are GREAT!) became truncated. They have an app for checking the HTML code of the file as part of their Linux front end.
So, I deleted all files and re-uploaded. Same problem.
Single pages display properly in Xara Preview, the entire website displays properly in Preview, the entire site displays properly no matter which browser is picked from the Preview site, however, if I go to an actual browswer window, the files are truncated!
When I get the answer, I'll post.
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