What settings are you using in the File Settings section of your Export dialog?
Hello Rikk, most often use JPG, 100% Quality, Adobe RGB (1998), at 300. Tried to TIFF 16-bit but did not work out well.
Are you using the latest release? 5.6?
I'm using version 5.5
I have the same problem!
Something got broken with my Lightroom 5.6 (Windows 7Pro) two days ago and I don't see any adjustments made with brush after exporting photos!
It's not a problem of library or RAW files - the same, work fine on other computers (iMac).
I tried to clean the computer with CC Cleaner Tool, and install everything again, but it didn't help.
I already lost 2 days trying to fix it, and I don't want to format the drive and install Windows again
Can anyone help?