Found the problem. Since I have very few MODs, I removed them one by one until I've found the one that was causing the problem. Thank you all for the help!
@SpookyDiver It is very unusual to have such a small localthumbcache.package. The size of the file depends, like @jpkarlsen already stated and @Bluebellflora proved, on the number of Sims you have in your save game and how and what you played. I have had saves localthumbcache.packages of over 100 MB and the current one is 43 MB at this time.
I play a rotational game with about 140 Sims in over twenty-five households in all the available worlds. I have all the packs and I also use some cc and mods. I frequently refresh the localthumbcache.package for no reason at all. I have never seen an automatic renewal of this file. But it if you claim it resets after it reaches about 100KB it could be due to the use of a modification that you might have installed.
Have fun playing. 😉
Found the problem. Since I have very few MODs, I removed them one by one until I've found the one that was causing the problem. Thank you all for the help!
