Very strange Client behaviour

Am testing a new solution using latest versions of Servoy. Have two machines connected to the database; one (PC Laptop) connected using Developer and an iMac G4 connected using Client. The client is using Client on a G4 mac also.

Client has created a number of related records and these records can be seen and display correctly on my local Developer machine which is the same as the client is seeing on their machine. However on my local Client, all the dates are showing as 1 day earlier. Am getting the same erroneous dates on a third Client machine at another location.

Timezones are set correctly on all machines.

Repository server is Sybase; database is mySQL.