Runtimes aren't visible immediately after adding via JBoss Tools Runtime Detection which can be confusing:

0. New workspace
1. Preferences -> JBoss Tools Runtime -> JBoss Tools Runtime Detection
2. Add, select folder with runtimes
3. Have checked all runtimes, OK for adding
4. Click on JBoss AS/Seam/Drools/jBPM Link
It's expected that newly added runtimes are visible immediately not after ok and going back to Preferences