Actually, this could be your problem.
Known Issue DNN5.0.1 / CATALooK.netStore v5.8.1
In this version the 'Log In' button on the address page of the CAT_Cart module will redirect to a blank page. To fix this request an update by email from
[email protected] or perform the steps below:
1. Logout
2. Add something to the cart
3. Go to: My Account -> Cart
4. Click on the 'Log In' button
5. Replace 'My Login Page' in the code below by the URL from your browser
<td class="CATRow" nowrap>
<asp:Label ID="lblGotoLoginPage" CssClass="CATSubHead" runat="server" resourcekey="LOGINHINT">If you already have a account:</asp:Label>
<div style="display:none"><asp:Button ID="btnGotoSignInPage" CssClass="CATCommandButton" runat="server" resourcekey="LOGIN"
CausesValidation="False" Text="Log In"></asp:Button></div>
<asp:HyperLink ID="lnkGotoSignInPage" runat="server" CssClass="CATCommandButton" resourcekey="LOGIN" NavigateURL="My Login Page">Log In</asp:HyperLink>
</td>
<td class="CATRow" colspan="2">
</td>
6. Logout
7. Login as Host
8. Go to My Account -> Cart
9. Select 'Edit Skin' from the module menu
replace this code by the modified code from step 5 :
<td class="CATRow" nowrap>
<asp:Label ID="lblGotoLoginPage" CssClass="CATSubHead" runat="server" resourcekey="LOGINHINT">If you already have a account:</asp:Label>
<asp:Button ID="btnGotoSignInPage" CssClass="CATCommandButton" runat="server" resourcekey="LOGIN"
CausesValidation="False" Text="Log In"></asp:Button></td>
<td class="CATRow" colspan="2">
</td>
10. Select 'Save Module Skin'
All problems are fixed in the v5.8.9.