Some users can't see the full tempo page, only the header (without the menu)

Some users can't see the full tempo page, only the header (without the menu) shows. And I can see errors in log. But some users can see the full tempo page and no errors. We have tried different accounts on same pc. So it should be account related issue. But according to the error log, I can't see any difference between these accounts. Please share your thoughts.

12:19:39,575 INFO [stdout] (ajp-/0.0.0.0:8009-19) 2015-11-05 12:19:39,572 [ajp-/0.0.0.0:8009-19] ERROR com.appiancorp.abdera.AtomEntryCollectionAdapter - An internal error occured while accessing the tempo feed
12:19:39,575 INFO [stdout] (ajp-/0.0.0.0:8009-19) java.lang.NullPointerException
12:19:39,575 INFO [stdout] (ajp-/0.0.0.0:8009-19) at com.appiancorp.tempo.abdera.TempoEntryAdapter.addAttachmentLinks(TempoEntryAdapter.java:1179)
12:19:39,575 INFO [stdout] (ajp-/0.0.0.0:8009-19) at com.appiancorp.tempo.abdera.TempoEntryAdapter.addEntryDetails(TempoEntryAdapter.java:957)
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OriginalPostID-177183

OriginalPostID-177183