Mmmm.... did you follow the upgrade instructions? I suspect that you have overwritten the new (1.5.x) files over the top of the old (1.4.x) files. If you have, please don't! That is not the recommended way to upgrade and is asking for trouble (like this).
Anyway... I would be surprised if this is related to the problem described in this thread. However, it won't hurt to see if you have a qti directory.
Re: When trying to import quiz/questions, drop down "browse files" does not appear.
{$a->নাম} - {$a->তারিখ} দ্বারা
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