CB Activity - questions

config: Joomla 2.5.6, CB 1.8.1, CB Activity 1.0.1

I have some difficulties to configure CB Activity:

1/ Tab Display

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The tab "Activity" is not displayed as configured:
(in the following the config is : display= self and connections")

1.a It does not appear in the following config:
for the current user when configuration is access for "self".
for the connexion when configuration is access for "connection only"

1.b It appears only for connected users when configuration is access for "connections and self". It should appear also for self, but does not appear.

2/ Date display

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2.a: i cannot make the date displayed, whatever the type of configuration
(either in the tab or in the "recent" page).

3/ Profile Display shift

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on refresh of the browser page, display issue:
after display of the Activity tab contents, the profile display is shifted right and lower ... wondering why, I have found no explanation. This happens automatically when the page is left untouched for some seconds.

1/ Tab Display

This controls the display of the activity. It does not control the access. Access parameter is directly below Display. Please read the descriptions to the right of a parameter carefully.

2/ Date display

Again, read the descriptions. This does nothing when Dynamic Timeago is used.

3/ Profile Display shift

Can not confirm. Please provide a screenshot of before and after the issue. Does disabling CB Activity resolve the issue? Does disabling Dynamic Update resolve the issue?