1
Please check below code
<apex:page controller="CheckboxValueC">
<apex:form >
<apex:inputCheckbox id="checkboxShowP" value="{!isChecked}">
<apex:actionSupport event="onchange" action="{!click}"/>
</apex:inputCheckbox>
</apex:form>
</...
1
The explanation for the page to not ignoring your permission when seeing it, is likely what Adrian Larson states in the first comment.
However, the explanation for you DMLs resulting in errors when you are not enforcing CUD (note that you are still missing checking the FLS, which should be done) is probably just because of the fact that you are using ...
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