strange hd44780 behaviour

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#1
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I bought LCD 44780 compatibile. I connected it with atmega16 and use varies of libraries.I use 4 bit data type. My problem is that it works ok, i mean shows what i want but only if i write program to it. After reset or powier down/on it my LCD doesn't initiate proper. After power on it shows unknown digits or show nothing.

That LCD looks a little old. Did anyone have similar problem??

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After power on the dispaly needs to be sent the commands to set it into 4 bit mode which I assume your code is doing but it may be that the display needs an additional delay after initalisation and before sending it data, some displays need an additional 64 ms delay after being initialised before they recieve the first data.