Hi,
I'm trying to recreate the problem. Please try these steps:
1. Start MTA-->Map Editor
2. Click on the 'definitions' icon and check race is in the 'Added definitions' list
3. Open map 'race-10laphotring'
4. Click on "Test", choose "Race" as the gamemode and then click on "Full Test"
5. Spawn and test the map
6. Press the enter key
Do you respawn after 5 seconds? (If not, press F8 and check for an error message)
7. Press [F1] and click on "Stop testing"
8. Click on "Test", choose "Race" as the gamemode and then click on "Full Test"
Does the 2nd test work correctly?