There are duplicate files checking into the release branch. It's easiest to see them at: https://fisheye6.atlassian.com/browse/~br=release4.10.0/flex-sdk
I found them by first checking out the release4.10.0 branch and making sure my working dir is clean and then checking out the master branch and seeing that the git status says that 11 files were deleted instead of the working dir staying clean. $ git status # On branch release4.10.0 nothing to commit, working directory clean $ git checkout master Checking out files: 100% (5456/5456), done. Switched to branch 'master' $ git status # On branch master # Changes not staged for commit: # (use "git add/rm <file>..." to update what will be committed) # (use "git checkout -- <file>..." to discard changes in working directory) # # deleted: mustella/Assets/Images/ButtonImages/play.GIF # deleted: mustella/Assets/Images/blank.GIF # deleted: mustella/Assets/Images/down.JPG # deleted: mustella/Assets/Images/next.JPG # deleted: mustella/Assets/Images/prev.JPG # deleted: mustella/Assets/Images/up.JPG # deleted: mustella/tests/Validators/EmailValidator/Properties/baselines/ipv6_InvalidIPDomainError_2.png # deleted: mustella/tests/Validators/EmailValidator/Properties/baselines/ipv6_InvalidIPDomainError_2_spark.png # deleted: mustella/tests/Validators/EmailValidator/Properties/baselines/ipv6_InvalidPeriodsInDomainError.png # deleted: mustella/tests/Validators/EmailValidator/Properties/baselines/ipv6_InvalidPeriodsInDomainError_spark.png # deleted: mustella/tests/mx/effects/Zoom/SWFs/Zoom_main.mxml The duplicates are either identical or just have a different case. e.g., https://fisheye6.atlassian.com/browse/~br=release4.10.0/flex-sdk/mustella/tests/mx/effects/Zoom/SWFs I think it would good to delete the duplicates so that it's clear which version of each file is being used and so that the working directory stays clean when switching branches. Thanks, --Dasa