Hi,
If you didn't install any additional plugis, and translation "dissapears" with no reason, please make sure if you are blocked by your translation provider by running this test: CLICK
Alse I can see you are using vBET 4.2.3, please remember that free Google Translation API wil be closed by 1st december, and is seting new strict limits, please consider upgrading vBET to the latest version which supports also Google API v2 (paid) and Microsoft Translation API (free) and another one is currently tested.
I can reduce your translation requests: CLICK