file opening corrupted

hi everyone,

there is something wrong where i try to open my file and the assets i have previously brought in have now darkened and it's not to do with the lighting. Something is going wrong between when i start a new file than save and close. It works perfectly fine when i start a new file, it's only opening every file that i have saved. There is also something that is strange, when i open a file it gets to 45% really quickly and gets stuck and won't open for another few minutes- it's as if the file is huge and taking forever to process, but the file is only 22mb. I have tried everything- force quitting, restarting. uninstalling, re-installing, downloading older versions. Nothing works. Yesterday Dimensions was working perfectly fine, it was only this morning that everything has become corrupted like this.

Please help i have had no luck with customer support.