Reader DC Tools to Select or Highlight text not working (or only sporadically)

i using adobe acrobat reader dc v "2015 release | version 2015.020.20042" on windows 7 pc.

 

it has worked great forever has developed, in last couple months, annoying habit tools seem 'check out' , not work. may start working again later (after reboot, or passage of time, or due other software change?). cannot forced work again exiting program , restarting it.

i can find pattern why starts nor why stops.

it affects many documents (and documents same, once issue begins). not matter of me trying highlight image (rather text) - can highlighting text in long document , cannot (except 1 word)... same paragraph.

it not think i'm using acrobat/pro - know reader , limitations. feature works , not others.

 

affected tools i've seen not anymore: hand (pan), select text (can select 1 word -by double-clicking), highlight.

 

i have tried "update" software , reported being date.

i have uninstalled app , re-installed adobe's website - , problem still re-appears.

 

how can address , make reader predictably functional , useful annotating again???

other potentially helpful troubleshooting tidbit: i'm accustomed using wheel-mouse ctrl+scroll zoom while looking @ document.

that feature not work when other tools become non-functional.

is there set of underlying technology tools these features rely upon going sleep on pc?

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