My first suggestion would be to open the Sublime console with View > Show Console
,. and then enter sublime.log_commands(True)
in the console. Once that’s done, Sublime will log all commands that are executed as the happen.
With that done, choose Preferences > Color Scheme
from the menu (it’s important that you do it from the menu and not the command palette).
Back in the console, this should generate output that includes:
command: select_color_scheme
If it doesn’t say that, or says something different, then there’s possibly a package or plugin that’s making things go wonky.
Generally speaking, in most cases reinstalling Sublime doesn’t have any effect on anything. How you uninstall differs depending on what OS you’re on, but the whole of your configuration (packages, key bindings, settings, etc) are stored in a place that’s not touched by the uninstall.
So if the problem is related to a package being weird or a bad configuration setting and things like that, all uninstalling and reinstalling does is waste time because once it’s back up and running it’s still configured exactly as it was previously.
What you can do is temporary revert to a freshly installed state to see if the problem persists there. This involves moving or renaming the folder that Sublime is storing your configuration in and then starting Sublime, which will make it act as if it was freshly installed.
Once that’s done you can test to see if the problem you’re having still perists, and if it does then the issue is not with Sublime, and we start trouble shooting from there. If it still happens, then the issue is possibly something with Sublime itself.
Instructions on how to revert to a freshly installed state are available here:
https://www.sublimetext.com/docs/3/revert.html
They can be a bit confusing, but this video shows you how to do it as well: