Here's an example using pymongo. I'm able to duplicate with different types of geo queries:

import re
from pymongo import Connection

coll = Connection().test.georegexlistfail
coll.ensure_index([('point', '2d'), ('words', 1)])
coll.insert({
'point': [1, 1],
'words': ['foo', 'bar']
})

q_regex =

{'words': re.compile('^f')}

q_geo = {'point': {'$near':[1,1]}}
q_both =

{'words': q_regex['words'], 'point': q_geo['point']}

def run(q):
print 'Query: %s' % str(q)
print 'Result: %s' % str(coll.find_one(q))
print

run(q_regex)
run(q_geo)
run(q_both)

"""
Output:

Query:

{'words': <_sre.SRE_Pattern object at 0x7f9fc21b63b0>}

Result:

{u'_id': ObjectId('4d0be668b45b5d4d2d000000'), u'words': [u'foo', u'bar'], u'point': [1, 1]}

Query: {'point': {'$near': [1, 1]}}
Result:

{u'_id': ObjectId('4d0be668b45b5d4d2d000000'), u'words': [u'foo', u'bar'], u'point': [1, 1]}

Query: {'words': <_sre.SRE_Pattern object at 0x7f9fc21b63b0>, 'point': {'$near': [1, 1]}}
Result: None
"""

Thanks!