Cattleya grow roots at different times. Some types grow new roots at the same time that a new lead or growth starts. The others grow a new lead but the roots don't start until the lead is well developed. Your plants may be in the slower part of the cycle betweem flushes of root growth. Also remember that Catts like to dry a little between waterings. Until they grow new roots you may not want to water the pots as often. Don't let the pot go dry but don't add liquid every day.