source rejects more then 25 nodes

[Harry]

i try to connect a few extra circle's to source to switch the x-mas lights.. but it refuses it.
i get a msg box that says you can not instal more then 25 node's?

in the licence box it says that the licence for 25- 250 nodes is there,......

in the past ,..let say 2 years ago i have used more the 25 nodes?,.....is there been a change in the latest update?

[Harry]

problem solved,....instaled the source version (newer) from the plugwise site