Error on "create new field"

CB Version 1.7.1 on fresh 1.7.2 joomla installation
Language: Italian
problem:
When I try to create a new field I get the following error: "Direct Access to this location is not allowed."

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I do not know if the following is helpful:
On mouse over the "create new field" button I read on the status bar: ...task=showField&view=showField#

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I have no error on "modify field" where I read on status bar: ...task=showField&view=showField#editField

any tips
thanks

[mod note: moved out of potential bug category]

If you can replicate on a clean Joomla/CB 1.7.1 website then we can discuss the potential bug possibility if we can replicate also.

You must have some outdated plugin installed that is causing this.

I reinstalled CB and now it's OK
thanks