Shares in medical diagnostics group Omega Diagnostics were looking poorly Friday morning after technical problems with a new manufacturing process prompted a profit warning.The group has had to abandon its new non-contact printing system for manufacturing protein spot slides for processing by its Genarrayt platform.Technical problems with the process have not yet been resolved and the group has taken the decision to revert to the previous manufacturing method, which produces the slides at a slower rate.As a consequence, the board expects revenue for the year to March 2010 to be ‘marginally lower than its previous expectations,’ which, in turn, will feed through to the adjusted profit before tax figure.