Official comment
Hi Marc,
Thanks for letting us know, the issue is logged and we will take a look into it as soon as we can, look out for a fix in a future release.
Using latest 4.2.1 OS X El Capitan although has happened on all versions of RB as far back as i can remember. When i launch Rekordbox i have to resize all my panes as they always start weird sizes, eg collection pane is tiny, tag list is huge. it always opens with the panes the same weird size so i'm guessing its not saving my pane dimensions when i resize them. can't see anything else on the forums, anyone else experience this?
Hi Marc,
Thanks for letting us know, the issue is logged and we will take a look into it as soon as we can, look out for a fix in a future release.
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Thanks! - here is a screenshot showing what Rekordbox looks like when i start it.
Not a major problem just a tad annoying!

Hi Marc,
We believe we could fix the issues you reported to us.
Please try the test version from the following link?
Hi, i have tested the lastest 4.2.1b release, it seemed to have worked.. until i connected it to Pro Link. If pro link is connected and a restart rekordbox it reverts back to the weird sizes