How many Fonts are currently installed on your PC? Are you using a Font management program? From InDesign preferences, set the Live Screen Drawing to "Never" which is inside the Interface panel. Turn the Preflight panel off by unchecking the On option within the Preflight panel. Within Preferences > File Handling panel uncheck the option "Always Save preview images with Documents". Disable Autocorrect if its on within the preferences. Within the Pages panel, go to Panel Options from the flyout menu and uncheck "Show Thumbnails". From the preferences > Display performance choose Fast display.
The CS6 default seetting of Delayed for Live Screen Drawing should be fine, so there's really no need to cripple the functionality entirely. Live drawing would only become an issue if the user delays dragging an object to see the live preview, and I don't believe there would be any connection to switching the Control panel context.
Disabling page thumbnails and switching to Fast display would, likewise, only be effective on an underpowered system. I suspect a font or font manager issue here.
How many Fonts are currently installed on your PC?
Thanks for the replies.
Yes, quite a lot I think. I tried Extensis Suitcase for Windows but that didn't seem to help the problem. Is there a better font management system for Win?
If there are a lot of fonts, say more than a thousand fonts, then I would recommend you to remove some fonts and only keep fonts that you frequently use in your development. Say about 300 - 400 fonts only should be good. Suitcase fusion updated to the latest version should cause no problems.