Hi!
There are multiple nodes that can do projection mapping in Maya.
Also i don't know if this a scene-specific problem or if it happens to you also for new scenes.
You also did not mention your Maya version.
Please "show" me what you are talking about
Is it this?
https://help.autodesk.com/view/MAYAUL/2019/ENU/?guid=GUID-B7E73748-5F8E-4E66-BE88-DF3C2A3DF438
or this?
https://help.autodesk.com/view/MAYAUL/2019/ENU/?caas=caas/video/youtube/watch-v-lFxvtePms8c.html
or anything else
At best add a screencast.
Without further information i can only suggest this:
Try a reset of your preferences.
Rename the folder prefs in folder 2019 to something like prefs_backup, or to reset everything, the folder 2019 to 2019_backup (or even the maya folder to maya_backup). Maya creates new folders (don't copy preferences from previous Maya versions). Detailed at:
https://knowledge.autodesk.com/support/maya/troubleshooting/caas/sfdcarticles/sfdcarticles/Reset-May...
It this does not help it's maybe a problem of your GPU/driver.