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Putty pecking
Tits are known to attack window frames
Members of the tit family frequently indulge in this activity in the late autumn and winter. Birds attacking window frames may be able to hear or see insects in the wood if the wood is old. They may also have a liking for the linseed in the putty. It may be that the putty contains a mineral or other substance that is lacking in the birds natural diet, and it is trying to make up for the deficiency. Other acts of vandalism such as paper-tearing may be connected.
It can be difficult to deter these acts but paints or fabric sealing strips can be used to cover the putty. If the linseed or fish oils in the putty are the reason for the behaviour, try using a synthetic putty such as Arbolite, which should be available from good hardware shops. Brushing the window frame with a compound containing aluminium ammonium sulphate, which is a distasteful compound, may also help to break this habit.