Version 5.0.7: Select text by mouse stops working

Version 5.0.7 (773) 64bit on Windows 10
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Problem 1:

The selection of any text stops working quite often.
I had to roll back to an older version.

Filetype php, via FTP, with Multihighlighter.

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Problem 2:

Another old Problem remains the same in this version:
Sometimes, without error oder notice, strange characters
are inserted in php-files.
In many cases at the position of closing brackets "}".

Best regards

Still no progress with the randomly injected garbage data at the end of code blocks?