Theme customization disappears after update

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I recently updated a site that a client wanted me to change - frpm 5.7.5.4 to 5.7.5.9.
After updating the site, all the custom styles that I created in
Edit Page > Page Settings > Design >Theme Customize > custom CSS
disappeared.
Using the Google developer tools, I was able to find the customization in
Application > Files > Cache > CSS > ThemeName > overrides.css

I was able to throw away this file, and replaced the customizations in the theme customization area, but I don't understand why they disappeared in the first place. Furthermore, some of the "old" customizations seem to be pervasive and can't be overriden.
Slowly I am beginning to think that "overrides.css" can't be pitched.

Can anyone explain how C5 handles the design customizations done through the Theme customize panel?

Sorry if I haven't explained this clearly - it is a bit complex....

Thanks for any response

I

arlenesey
 
hutman replied on at Permalink Reply
hutman
When you are doing development (customizations) do you have the Cache turned off? Sometimes the customizations do save but don't display on the front end when you are viewing it out of edit mode because the old version is cached.
arlenesey replied on at Permalink Reply
arlenesey
Thanks for the reply, hutman.

I always have cache turned off during development, and I have "cleared" the cache manually several times.

I never looked in Application > Files, before this situation. Is it always so full? I guess I always thought that the media files were in the concrete folder. Makes total sense, though.
arlenesey replied on at Permalink Reply
arlenesey
Oh and another clarification: when I said that the custom styles disappeared, I should have said that the css code disappeared from the window in "Advanced > CSS customization"
The styles themselves, or rather the effects, were still in force - I assume because of the phantom "overrides.css" buried deep in the Application folder.