diff --git a/src/pretix/base/models.py b/src/pretix/base/models.py
index 37379050cb..c3b578570d 100644
--- a/src/pretix/base/models.py
+++ b/src/pretix/base/models.py
@@ -1618,7 +1618,7 @@ class Order(Versionable):
         error_messages = {
             'unavailable': _('Some of the ordered products were no longer available.'),
             'busy': _('We were not able to process the request completely as the '
-                      'server was too busy. Please try again.'),
+                      'server was too busy.'),
         }
         positions = list(self.positions.all().select_related(
             'item', 'variation'
diff --git a/src/pretix/plugins/paypal/payment.py b/src/pretix/plugins/paypal/payment.py
index 5c48944d28..52611806f8 100644
--- a/src/pretix/plugins/paypal/payment.py
+++ b/src/pretix/plugins/paypal/payment.py
@@ -3,7 +3,6 @@ import json
 import logging
 
 from django.contrib import messages
-from django.core.urlresolvers import reverse
 from django.template.loader import get_template
 from django.utils.translation import ugettext_lazy as _
 from django.utils.translation import ugettext as __
diff --git a/src/pretix/presale/views/order.py b/src/pretix/presale/views/order.py
index 2f189a90fe..de89baef2e 100644
--- a/src/pretix/presale/views/order.py
+++ b/src/pretix/presale/views/order.py
@@ -83,7 +83,11 @@ class OrderDetails(EventViewMixin, EventLoginRequiredMixin, OrderDetailMixin,
         )
         if self.order.status == Order.STATUS_PENDING:
             ctx['payment'] = self.payment_provider.order_pending_render(self.request, self.order)
-            ctx['can_retry'] = self.payment_provider.order_can_retry(self.order) and self.payment_provider.is_enabled
+            ctx['can_retry'] = (
+                self.payment_provider.order_can_retry(self.order)
+                and self.payment_provider.is_enabled
+                and self.order._can_be_paid(keep_locked=False)
+            )
         elif self.order.status == Order.STATUS_PAID:
             ctx['payment'] = self.payment_provider.order_paid_render(self.request, self.order)
             ctx['can_retry'] = False