I would first make sure both software are excluded (trust each other) -- Avast and OA. The best way to exclude both OA and Avast is the following:
To exclude OA in Avast:
· Settings > Exclusions > Add > search for Online Armor and click on the box to the left of it and add it, then click OK.
· Real Time Shields > Expert Settings > Trusted Processes > Add > search for Online Armor and click on the box to the left of it and add it, then click OK.
· Behavior Shield > Expert Settings > Trusted Processes > Add > search for Online Armor and click on the box to the left of it and add it, then click OK. Also change action to take in Behavior Shield to “Ask.”
To exclude Avast in OA:
· Open the OA GUI > Options > Exclusions > Add > click on the pop-up window and find C:\Program Files\Avast Software.
· When you reboot OA (to go into Learning Mode), make sure ALL Avast shields are left on.
· Reboot your machine again; OA requires two boots. After this second reboot, you may get a pop-up asking you if you trust Avast. Answer the pop-up as "Trust Always" and "Remember My Decision" and you should not get any more pop-ups.
· Open the OA GUI > Programs > untick "Hide Trusted" so that you can see everything > look to make sure everything from Avast is not "blocked" (red) or "ask" (yellow). If it is, right-click the item and change it to "Trust." Reboot.
· Open the OA GUI > Options > Backup/Restore > Save your settings once you have everything the way you want it.
Also make sure you have the current version of firefox on your machine and any plug-in's and add-on's. Make sure these are not blocked by OA or Avast Behavior Shield.
Make sure your software on your machine is current, esp. Java and Flash which recently had updates. The easiest way to check is to go to Secunia PSI and do a free scan. It will give you the vendor's download link if you need an upgrade, then reboot your machine in between any uninstall and install. Remember if you have to upgrade Java or Flash to always use their Unistaller tool, reboot, then install the newest version so no remnants are left behind...do not upgrade.
Let us know how you do or if you have any questions. I've been using OA and Avast for years, so I'm very familiar with both products.