Have found that IE can have that issue occasionally, I will usually press the "Switch Editor to Source Mode" button on the message box toolbar (first button on the left) to address that.
You can also confirm the issue by modifying includes/filenames.php changing:
Code:
define('FILENAME_SQLPATCH','sqlpatch');
on the right side to some other "less likely" name to be blocked, and then change:
admin/sqlpatch.php to match at least the first part of the filename before the extension.
Be sure to have logged out and back in. If it now works, then definitely yes is a host restriction issue (and can rather quickly get back to "work").
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