strange display behaviour in tabpanel on Smart Client

Classic Servoy
1

Hi,
since I have created a new form (list view) and added as related tab to an existing tabpanel, I get this strange display behaviour:

If I create a new related record with the “+” button:
[attachment=2]sped_pic_2.png[/attachment]
The tabpanel displays a screenshot from the main form??

Now I have loaded a picture into the media column:
[attachment=1]sped_pic_4.png[/attachment]

And when I delete the record:
[attachment=0]sped_pic_6.png[/attachment]

Never before I had this strange behaviour and I have no idea where it comes from.
All other tabs and tabpanels (related) are working as they should do.

If I change the (main)record and/or the tab the display disappears.

Servoy 7.4.11
Win 10
Java 8 several versions tried

Does anybody have an idea how I can fix this?

Best regards

sped_pic_6.png
sped_pic_6.png1535×538 53 KB

sped_pic_4.png
sped_pic_4.png1538×536 104 KB

sped_pic_2.png
sped_pic_2.png1537×536 26.6 KB

2

I have now detected that this problem occurs because of a set style.
This is my style:

form, odd, even, selected {
	background-color: transparent;
	color: #000000;
}

form odd {
	background-color: #FFFFFF;
}

form even {
	background-color: #f1f5fa;
}

form selected {
    background-color: #808080;
    color: #FFF;
}

form.alternate odd {
	background-color: #FFFFFF;
}

form.alternate even {
	background-color: #e0e0e0;
}

form.alternate selected {
    background-color: #88c4ff;
    color: #FFF;
}

form.alternate1 odd {
	background-color: #ffffff;
}

form.alternate1 even {
	background-color: #ffffff;
}

form.alternate1 selected {
    background-color: #ffffff;
    color: #FFF;
}

form.alternate2 odd {
	background-color: #ffffff;
}

form.alternate2 even {
	background-color: #ffffff; /*#f1f5fa;*/
}

form.alternate2 selected {
    background-color: #e0e0e0;
    color: #000000;
}

Is anything wrong with it?
I use this on many other forms without any problems.

Best regards