Which version of Lightroom mobile are you using and which mobile device are you using?
Does the random colored box stays on the image if edit it or export it to gallery/photos?
Moving to Lightroom CC for mobile & Apple TV
Thank you for the reply Akash! I use the latest Lightroom CC in windows PC and Lightroom mobile on an IPad/ iPhone. The corruption does not appear in Lightroom CC...Only in the mobile version. The corruption does appear when exported, edited or shared elsewhere. When I made a virtual copy of the image, it looked fine. I recently did some photos and did not experience any issues.
Sent from Yahoo Mail for iPhone
Let us know if the issue reappears.