Invalid Materialized View

I've got a bit of a strange one here (8.1.7.4 on UNIX) - A MV that is INVALID when I query USER_OBJECTS but when I compile it via SQL PLUS it says it compiles but still remains INVALID:

Code:

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SQL> select count(*) from MV_MOVEMENT_PROCESSES
  2  /

  COUNT(*)
----------
  2050895

SQL> select status, object_type from user_objects where object_name='MV_MOVEMENT_PROCESSES';

STATUS  OBJECT_TYPE
------- ------------------
VALID  TABLE
INVALID MATERIALIZED VIEW

SQL> alter MATERIALIZED VIEW MV_MOVEMENT_PROCESSES compile;

Materialized view altered.

SQL> select status, object_type from user_objects where object_name='MV_MOVEMENT_PROCESSES';

STATUS  OBJECT_TYPE
------- ------------------
VALID  TABLE
INVALID MATERIALIZED VIEW

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The status in USER_MVIEWS show COMPILATION_ERROR - how can I find why this is INVALID??
I've also kicked of a refresh that seems to be working and hasn't complained the MV is INVALID??

Actually using 9.2.0.4, not 8.1.7.4!!

Even more confused now the refresh has worked:

Code:

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SQL> execute dbms_mview.refresh('MINE1.MV_MOVEMENT_PROCESSES');

PL/SQL procedure successfully completed.

SQL> select status, object_type from user_objects where object_name='MV_MOVEMENT_PROCESSES';

STATUS  OBJECT_TYPE
------- ------------------
VALID  TABLE
INVALID MATERIALIZED VIEW

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Bug.2695199/2639679 - MATERIALIZED VIEWS BECOME INVALID AFTER ALTER OR REFRESH ??