Failure To Sync - 0xE800002D

In the last few days, I've been getting the following error when syncing apps with my iPhone 4:

The app "1Password" was not installed on the iPhone "Isla 4" because an unknown error occurred (0xE800002D).

The app name is irrelevant, because it says this about every single app that is out of sync between my iPhone and MacBook. I am a professional technology consultant, so have already tried a number of steps to resolve the problem. What I know so far is this:

1 - Using a different sync cable made no difference.
2 - Using a different USB port made no difference.
3 - I can download apps directly to my iPhone without trouble, but they don't sync back to my Mac.
4 - I can download apps directly to my Mac without trouble, but they don't sync back to my iPhone.
5 - Syncing my contacts, calendar, mail and music all sync properly, and do not cause any errors.

So this issue appears to relate ONLY to app syncing (in either direction), and came up out of the blue.

If anyone has ever experienced this specific error before, and knows how to resolve it, please help! I've been considering a full wipe and restore of my iPhone, but it's a step I'd prefer to avoid if possible.

Thanks in advance.

-- Matt Ryan