Acrobat Pro 'find' function doesn't work consistently

[madsci]

This has been driving me nuts lately - I can't reliably use the 'find' command to find simple text even though it shows the proper number of hits in the suggestions.

At the moment I'm viewing a truck manual. I hit control-F and enter "fuses". I get "no exact match" and then 22 results for "fuses" in the suggestions drop-down. If I click on the suggestion, it just redraws the drop-down. Advanced search finds no results.

Chrome's PDF reader finds it just fine, and agrees there are 22 results. If I select a section of text and paste it into Notepad I can find 'fuses' just fine, so it's not that it's showing up as an image or something. 

Acrobat Reader DC behaves the same for me.

It's not just this one document - it happens across all of the datasheets and technical manuals I read, too.

What gives?

[madsci · Accepted solution]

I found a solution - Edit | Preferences | Search | Purge Cache Contents seems to have fixed the problem for me.