Hello again,
Filtering on #snow and “#snow” would yield slightly different results. Without quotes, #snow, explicitly filters on Tweets with the exact #snow hashtag (matching in the hashtags provided in the ‘twitter_entities’ payload). Due to how PowerTrack tokenizes around whitespace and punctuation, “#snow” would additionally match on #snow_man. So, using quotes will match on more Tweets, and if you are targeting specific hashtags, the hashtag Operator (i.e., #) is recommended.
I was not able to produce your original issue with loading rules with the # Operator (and again this Operator is one of the most commonly used Operators), so I don’t think this was a Gnip rule validation issue, and likely caused by something else like how the rule was JSON encoded. Without seeing the returned error message, it’s hard to know. Regardless, glad you figured it out.