Audio conflict Wavelab/Cubase

For several months now I have an audio conflict by switching from Cubase to Wavelab or from Wavelab to Cubase or to other software like Sibelius or by using Groove Agent 4 without opening Cubase. Sometimes it works good but lately I can only hear audio from 1 program and then I have to restart my computer and open the other program to hear any sound. It Always worked good together and I didn’t change the device settings or installed new software. Does anyone recognize this and have a brilliant tip because I’m getting out of patience… I’m working with Windows 7 and Cubase 8 pro, Wavelab elements 7 and Groove Agent 4.

I have an Edirol UA101 audio device with the latest driver installed on it.