Fix for #187?

app/src/main/java/eu/kanade/tachiyomi/ui/catalogue/CatalogueGridHolder.kt

@@ -50,6 +50,7 @@ class CatalogueGridHolder(private val view: View, private val adapter: Catalogue
                     .load(if (headers != null) GlideUrl(url, headers) else url)
                     .diskCacheStrategy(DiskCacheStrategy.SOURCE)
                     .centerCrop()
+                    .placeholder(android.R.color.transparent)
                     .into(view.thumbnail)
 
         } else {

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryHolder.kt

@@ -63,6 +63,7 @@ class LibraryHolder(private val view: View, adapter: LibraryCategoryAdapter, lis
                             .diskCacheStrategy(DiskCacheStrategy.RESULT)
                             .centerCrop()
                             .signature(StringSignature(it.lastModified().toString()))
+                            .placeholder(android.R.color.transparent)
                             .into(itemView.thumbnail)
                 }
             }