Googledocs spreadsheet issue

I have an issue viewing spreadsheets that are on googledocs on my Viewsonic Viewpad 7 running Android. The spreadsheet opens and the cell borders are viewable but the contents of the cells aren't unless, sometimes, when you drag the view they breifly become visible whilst being dragged.

The problem exists in both the browser view of GoogleDocs and the official Google DOCs application for Android, and the problem exists on both spreadsheets uploaded from excel to google docs and spreadsheets created from scratch on google docs.

The spreadsheets view okay on a desktop PC and I'm not using any special colours in the spreadsheet for cells, nor text.

Does anybody have any ideas about this?