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What could be causing this?

you can ignore this message. it appears always, even if the file is correct. possibly just a wrong placed WriteLine-Command. will be fixed, if i´ve time for it

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Also another question, when loading alot of files (more than can can be shown by the tabs), how do we select tabs that cannot be seen to the right?

this is a known problem for the current version. i´m working on it to fix it in 2.1.
but before version 2.1 you can use Strg+Tab or another theme.