Calc borders do not display

I am running LO 3.5.4.2. on Mac OSX 10.7.4. Calc cell borders do not show on the page apart from basic single lines, no broken or double lines, for example. The borders will, however, print and PDF correctly. How can I correct this?

Upgrade to 3.5.5. We fixed nearly all border bugs there. Some more are fixed in 3.6.0Beta1.

Thanks, Moggi, I thought I already had the latest version - I was about to return to OpenOffice, but I shall now persevere now I know it’s not just me!