I was writing an extremely simple custom module (for a D6 site) to make use of hook_block. Every time I enabled the module the blocks no longer displayed on the pages. Since it had been a long time since I had done any work in D6, I figured there must be something I was overlooking in how I wrote the function. If I disabled the module (or even just commented out the hook_block) function then the blocks reappeared. So, I spent a fair amount of time looking over how I had written the hook. But, I couldn't see anything wrong with it.

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