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There's a bug in the DaVinci Resolve 12 beta that can cause the contents of a bin to disappear if certain characters are used in the bin name. What makes it particularly concerning is that there is no indication that anything is amiss until the project is loaded again, so it is easy to lose hours of work this way.
And because the bug only occurs when a project is reloaded, you cannot load up an autosave to get the clips back either.
Here's how to reproduce it:
1. Create a new bin with a forward slash in the name, e.g. "1 / 2".
2. Drag some clips into it.
3. Save the project and close Resolve.
4. Reopen Resolve. The bin will now be called "1" (everything after the forward slash is omitted) and will be completely empty.
It's worth noting that the clips and sequences do not appear to actually be removed, just hidden. You can verify this by attempting to create a new sequence with the same name as one that disappeared, only to be told that a sequence of that name already exists.
I have not however been able to come up with a strategy for unhiding the bin contents again - renaming the bin back to the old name did not restore the clips. If anyone can come up with a way of doing this I'd be very interested to hear it.