First findings..

I found one more thing. At times, i get the following message:
"Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'micro_admin' was given in menu_execute_active_handler() (line 501 of ...\drupal-7.0\includes\menu.inc)."

Thanks for your quick response.
4. 'Warning: call_user_func_array()" shows when you
A. go to Micro types >> Add >> Save (admin/structure/micro/add).
B. Show a node with micro's attached.
Only the first time. I don't know how to provoke the error another time - flushing caches doesn't work; restarting server does; un/reinstall too?

5. Please add the following line to micro.info-file. it will give you an extra link on page admin/modules/list.
configure = admin/structure/micro

6. A new micro type cannot be deleted. The following error after: create micro type ( append to node, no fields yet )>> Save >> Delete micro type.
"Recoverable fatal error: Argument 1 passed to micro_type_delete() must be an instance of MicroType, string given, called in micro.admin.inc on line 496 and defined in micro_type_delete() (line 1300 of micro.module).

7. Perhaps something to do with my server-settings & AJAX:
- Create a node, save
- Show node, add a micro with settings Display type = inline; Input type = Inline ==> OK
(I can only add, Delete button is not shown)
- Show node, add a micro with settings Display type = inline; Input type = Ajax_form ==> Error via global pop-up (see attachment)
(I can only add, Delete button is not shown)
- Show node, add a micro with settings Display type = inline; Input type = Ajax_flag ==> I can only Delete, no Create button
And when deleting the micro, global pop-up shows (see attachment 2)

8. If I attach a micro to a node, it comes at top pf the page. How can I influence the sort order? It would be nice if the micro-field shows up on the 'manage/display fields' tab.

9. If a micro is attached to none of the content types, it shows on ALL content types. This is good behaviour for some modules, but I doubt if micro should do so.

If you want me to create new issues, instead of appending this one, please tell me so.

I tested your version of 15-jan. Here's a recap of the status:
Fixed = 1, 2, 5;
Fixed = 4 (call_user_func_array() warning)
Open = 3 (page admin/content/micro is left blank).
t.b.d. = 7 (ajax)
Open = 8 (sort order of micro field in Content type)
Open = 9 (attach to none or all)

ad 6: a new micro type can be deleted, but i get the following error message (I use entity.module -dev of 26-jan):

6A. I get this error when deleting a micro type:
PDOException: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '))' at line 1: DELETE FROM {micro} WHERE (mid IN ()) ; Array ( ) in EntityAPIController->delete() (line 399 of ..\modules\entity\includes\entity.controller.inc)

6B. I get this error when deleting a node. (It was connected to a microtype, but I don't know if this isrelevant.)
PDOException: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')) AND (base.eid = '10223')' at line 2: SELECT base.mid AS mid, base.mtid AS mtid, base.uid AS uid, base.eid AS eid, base.created AS created, mt.machine_name AS type FROM {micro} base INNER JOIN {micro_type} mt ON base.mtid = mt.mtid WHERE (base.mtid IN ()) AND (base.eid = :db_condition_placeholder_0) ; Array ( [:db_condition_placeholder_0] => 10223 ) in EntityAPIController->query() (line 154 of C:\Damp\Sites\hunkemoller.nl\sites\all\modules\entity\includes\entity.controller.inc).