Thank you for uploading logs.
TuneBrowser is copying image files to cache folder in C: drive to access quickly for the next time. And in your case, reading cached files were failed. Unfortunately, the reasons of these failure are not recorded in log (I’d like to record them at the next release).
For example, if your C drive is low on free space, this situation may occur… Do you have any idea what’s going on?
To avoid image cache, open the preferences dialogbox, select tree item: “Window/View” – “View” – “Image processing”, set “Cache images to disk” – “Cache images to disk” to “No”.