Problem description & how to reproduce it :

1. Create a post that has the tag "geo_mashup_save_location". The issue can
be reproduced when using the XML-RPC interface, but not from a browser. I
use WordMobi (mobile based wordpress blogging software @
http://code.google.com/p/wordmobi/) to create & publish this post.

2. The post gets saved, without the (lat, lon) information. However, the
tag(shortcode) is removed from the post.

3. Net result : WordPress post has been saved, but without the (lat,lon)
information.

Expected output : Post should have been saved with (lat,lon) information.

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Software versions

Geo Mashup Plugin : 1.2.7
WordPress         : 2.8.4

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I have looked into the problem, and here is my analysis:

The cause of the problem seems to be in file geo-mashup.php, function
load_hooks(): 

"save_post" is added as a filter only if is_admin() returns true.
is_admin() returns true only when the person posting is using a browser
interface (plus is logged in properly).

When the post (with the tag) is created using XML-RPC, the
'content_save_pre' hook gets invoked. The tag gets parsed, the geo
information is obtained, and the tag gets removed from the content.
However, the hook for 'save_post' does not get invoked in this scenario.
Due to this, the geo location does not get saved.

A possible fix : Add the 'save_post' hook irrespective of "is_admin()". I
have made this modification in the attached file. I'm no wordpress guru, so
I am not sure if this is completely correct. However, this change works for
me at the moment.

I'm not familiar with the functionality enabled by 'wp_handle_upload', but
please have a look at that too.