Joomla version ?
CB version ?
CBSubs version ?
Try installing latest nightly version if not nightly. Some fixes have been made in those areas.
IF nightly, then it seems that something makes the switch to subscription impossible. Here a short troubleshooting guide:
- Is your Paypal payment button "Pay" or "Subscribe" ?
- Is at Paypal the payment subscription registered ?
- Did you try to set paypal gateway to only autorecurring ? and in that case, does the payment subscription button appear ? if not, then there is a setting sissue or settings mismatch between plan and gateway, or between plans if multiple plans are used same time.
- If you set first payment 0.05 instead of 0, does it work as you intend ?