problem glitch moving object editing nodes ect

[slayer3103 0]

heres my problem one is when i import image some times if i node edit them after im done the whole image dissapears second some files i can node edit them but i have no control over where the nodes go its like its not reacting to my movements with the mouse third once this happens if i try putting anything in the screen i can not move it precisly anymore again it moves very akwardly with the mouse only way i can fix it is to reinstall signblazer wth is wrong