The following steps help solve most issues:
UPDATE
Go to Apple App Store -> Updates, find Recolor and make sure that you have the latest version. If the button says 'update', please tap it to install the latest update.
RESTART
To restart your iOS device:
CHECK RECOLOR
After the above steps, open Recolor again and see if the issue still persists.
SOLUTIONS
Check the articles under the Solutions menu to see if there already is a quick fix for the issue you are experiencing.